feat(firebase_messaging): Adds the action identifier

[Hackmodford]

Description

Adds the action identifier to the RemoteMessage object

Related Issues

#17315

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[MichaelVerdon]

Hey there 👋 , can you please sign the CLA?

[russellwheatley]

@Hackmodford - Considering this is Apple specific, I think it should be on this: https://github.com/Hackmodford/flutterfire/blob/feat(firebase_messaging)--Add-ios-action-identifier/packages/firebase_messaging/firebase_messaging_platform_interface/lib/src/remote_notification.dart#L69

You can update it on the notificationDict by accessing notificationDict["@notification"]["@apple"]. You will also need to sign the CLA.

[Hackmodford]

@russellwheatley I considered that, but noticed the category (which is Apple specific) is not there. So I put it next to that for consistency.

@MichaelVerdon I'm in the process of getting authorization from my company to sign the CLA.

[Hackmodford]

CLA has been signed.